Electric heater



Jain. 3, 1928.

J. H'. CARMEAN ELECTRIC HEATER iled Feb. s. 1926 ATTORNEY Patented Jan. 3, 1928.

TUNITED STATES PATENT OFFICE.

JAMES H. CARMEAN, OF KANSAS CITY, MISSOURI.

ELECTRIC HEATER.

Application filed'lebruary 5, 1926. Serial No. 86,189.

My invention relates to electric heaters and more particularly to a portable heater of a.

' type commonly used for supplementing the facilitating distribution of air heated bypassage through the device.

A further object of the invention is to. localize effect of the heating unit at the interior of the burner to avoid injury to persons or articles coming in contact with the outer'wall. I

In accomplishing these and other objects of the invention 1- have provided improved details of structure, the preferred forms of which are illustrated in the accompanying Referring more in detail to the drawings:,

1 designates a housing wall, preferably constructed of sheet metal, circular in cross 1 section and having legs 2 welded or otherwise permanently secured to Its outer face at one end, whereby the heater may be supported a sufficient distance above a floor or other base to permit air to circulate freely V to and through the interior of the housing from beneath.

Fitted into the lower end of the housing wall and held snugly thereto by frictional contact is a ring 3 having a head 4 at its outer edge overlying the edge of the housing and constituting a handle whereby the ring may be inserted into and removed from the housing, and having an inturned flange 5 at its inner edge, forming a shelf for supporting a'screen 6. The screen is welded or otherwise attached to the shelf flange 5 and, when the ring is in place, forms a floor for completely closing the bottom of the housing, but

through which air may pass to constitute a circulating heating medium.

At the top of the housing is a ring 3', having a, bead i, a fiange 5' and a screen 6,

cor respending to like parts heretofore de-f scribe as located at. the bottomfof' the housing; the upper ring, however, being provided with an arched cross strip 7 ,'constituting' a handle whereby the heater may. be carriedfrom place to place, the ring fitting the. housing sufficiently close to support the weight of the heater, although being capable of removal therefrom when-desired; 1 Located within the housing wall is a. cylindrical flue drum 8, of sufficiently less diameter thanthe housing" to provide an annular air space 9, and supported in place by bolts 10 which pass through the housing, through 7 the drum and through spacers 11 which ce'nter the drum relative to the'housing walland tend to maintain theair'space at uniform width throughout its, circumference. and. height. There may be any suitable number 15 of such bolts, arranged in anyefiective relation or series, but servingfto:retain the flue drum spaced from the bottom and top rings so that cool air entering beneath"the housing may pass through the bottom screen, over the bottom ring flange, into and through the annular air space to exit between the top of the flue and upper ring flange and out through the upper screen, absorbing and carrying off heat radiated from the'fiue drum and preventing heating of the housing wall. Other air entering the interior of the flue drum passes over a heating unit contained within the drum, to be delivered through the upper screen at a temperature sufiicient to 9 raise that of the room within which the heater is contained.

The heating unit which I prefer to employ consists of a skeleton frame of spaced, parallel plates 12 of porcelain or other nonconductive material, shaped and dimensioned to fit snugly within the flue drum and be held thereto by frictional contact of their ends with the inner face of they. drum; the plates having registering apertures 13 through which a resistance wire 14 is passed in hairpincoils and in vertical tiers. Opposite ends oft-he coil wire are provided with binding pggts 15 and 16 for connection with the line wires 17 and 18 that are conducted through the drum and housing in' a cord 19 for connection with a fixture or wall socket-by a switch plug (not shown). I

Qperation of a heater constructed and assembled as described is obvious. When 10- cated in aroom and connected with a source of current, the coil heated, causing a thermo-siphonic circulation through the drum and jacket, to heat the inner volume of air and prevent heating of the housing wall.

By reinovably mounting the top and bottom screens, vcleaning, replacements and repairs may be easily efl'ected.

Economy and ease of construction, operation and assembly of a heater constructed as described is also obvious from the foregoing,

comprising a housing wall, a ring fitting within'said wall, having an exposed bead overlying the edge of the housing wall, and havin an inturned shelf flange, a screen on said s elf flange, closing the end of the housing wall, a flue drum within the housing wall, spaced from the wall and from the a screen, and a heating unit within the flue drum.

3. A heater of the character described, comprising a housing wall, top and bottom rings in said wall, each having an inturned shelf flange and a screen attached to said flange, and an arched strip attached to the .upper ring and constituting a handle.

4. A heater of the character described, comprising a housing wall, a ring fitting within said wall, having an inturned shell flange, a screen on said shelf flange, closing the end of the housing wall, a flue drum within the housing wall, spaced from the wall andfrom the screen, and a heating unit within the flue drum comprising non-conductive, spaced plates and a resistance coil carried by said plates.

5. A heater 01 the character described, comprising a housing wall, a ring fitting .within said wall, having an inturned shelf flange, a screen on said shelf flange, closing the end of the housing wall, a flue drum within the housing Wall, spaced from the wall and from the screen, and a heating unit Within the flue drum comprising non-conductive, spaced plates and a resistance coil carried by said plates and feed Wires for the coil extending through the flue drum and housing wall.

In testimony whereof I afiix my signature.

. JAMES H. QARMEAN. 

